Typing indicator

[Jiscona-private]

I am trying to create a typing inidcator for a real time chat application and was wondering, what the best way to do this is. Currently, if a user is typing, an update will be posted to the "typing" topic:
<input type="text" id="userMessage" placeholder="Nachricht" @input="userTyping">

userTyping() {
     let username = sessionStorage.getItem("hermes-chat_uname");
    //send request
    var postUrl = "[server]";

    var xhr = new XMLHttpRequest();
    xhr.open("POST", postUrl);

    xhr.setRequestHeader("Authorization", "Bearer [auth token]");
    xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");

    var data = `topic=user/typing&data={"typer": "${username}"}`;

    xhr.send(data);    
}

When the site receives a message of the topic user/typing, the typer will be shown.
Is there a better way to do it, e.g. with the "Active Subscriptions" API?